89 lines
1.7 KiB
Go
89 lines
1.7 KiB
Go
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package redis
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import (
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"fmt"
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"time"
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"github.com/garyburd/redigo/redis"
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)
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// Redis is a cache backend.
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type Redis struct {
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pool *redis.Pool
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prefix string
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}
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// New Redis backend.
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func New(address string, db int, prefix string) (*Redis, error) {
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r := &Redis{
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prefix: prefix,
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pool: &redis.Pool{
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MaxIdle: 3,
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IdleTimeout: 240 * time.Second,
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Dial: func() (redis.Conn, error) {
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return redis.Dial("tcp", address,
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redis.DialConnectTimeout(10*time.Second),
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redis.DialDatabase(db),
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redis.DialKeepAlive(30*time.Second),
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)
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},
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},
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}
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return r, nil
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}
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// Get a key from Redis.
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func (r *Redis) Get(key string) ([]byte, error) {
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conn := r.pool.Get()
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n, err := redis.Bytes(conn.Do("GET", r.prefix+key))
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if err != nil {
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return nil, fmt.Errorf("Redis SET error: %s (conn error: %s)", err, conn.Err())
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}
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return n, err
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}
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// Set a key in Redis.
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func (r *Redis) Set(key string, v []byte, expires int) error {
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conn := r.pool.Get()
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_, err := conn.Do("SETEX", r.prefix+key, expires, v)
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if err != nil {
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return fmt.Errorf("Redis SET error: %s (conn error: %s)", err, conn.Err())
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}
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return nil
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}
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// Delete keys from Redis.
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func (r *Redis) Delete(key ...string) {
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conn := r.pool.Get()
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for _, v := range key {
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conn.Send("DEL", v)
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}
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conn.Flush()
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conn.Receive()
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}
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// Keys returns a list of Redis keys matching a pattern.
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func (r *Redis) Keys(pattern string) ([]string, error) {
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conn := r.pool.Get()
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n, err := redis.Strings(conn.Do("KEYS", pattern))
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return n, err
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}
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// Lock a mutex.
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func (r *Redis) Lock(key, value string, expires int) bool {
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conn := r.pool.Get()
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n, err := redis.Int(conn.Do("SETNX", r.prefix+key, value))
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return err == nil && n == 1
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}
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// Unlock a mutex.
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func (r *Redis) Unlock(key string) {
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r.Delete(key)
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}
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